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AEAS-7000 Datasheet

Plug and Play Ultra-Precision Absolute Encoder 16-bit Gray Code

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Agilent AEAS-7000
Plug and Play Ultra-Precision
Absolute Encoder 16-bit Gray Code
Data Sheet
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Description
The encoder IC consists of 13
signal photo diode channels and
1 monitor photo diode channel
and is used for the optical
reading of rotary carriers (i.e.,
discs). The photodiodes are
accompanied with precision
amplifiers plus additional
circuitry.
The monitor channel is used to
drive a constant current source
for the highly collimated IR
illumination system.
Functional Description
Background
The 13 signal channels are set up
as:
1. Two precision defining signals
(A0, A09), which are two 90°
electrical shifted sine, cosine
signals. These signals are
conditioned to be compensated
for offset and gain errors.
After conditioning they are on
chip interpolated (4 bit) and
computed to an absolute 6 bit
Gray code. Additionally, these
Sin/Cos signals can be tapped
as two true-differential analog
outputs to be used at the
system designer’s choice.
2. 11 analog (A1-A11) channels
which are directly digitized
by precison comparators with
hysterisis tracking. The
digitized signals are called
D1-D11.
An internal correction and
synchronization module allows
the composition of a true 16 bit
gray code by merging the data
bits of 1) and 2) by still keeping
the code monotony.
There is a Gray code correction
feature for this encoder to
counter any codewheel
imperfection or misalignment.
This Gray code correction can
be disabled/enabled by the pin
KORR.
The gain and offset conditioning
value of the sine and cosine
wave has been on-chip preset
by factory. This will
compensate for mechanical
sensor misalignment error.
Features
• Minumum mechanical alignment
during installation
• 2 Sine/Cosine true differential
outputs with 1024 periods for unit
alignment
• Integrated highly collimated
illumination system
• 11 digital tracks plus 2 sin/cos
tracks generate precise 16 bit Gray
code
• Ultra fast, 1 µs cycle for serial data
output word equals 16 MHz
• On-chip interpolation and code
correction to compensate for
mounting tolerance
• MSB can be inverted for changing
the counting direction
• Internally built in monitor track for
tracking the light level
• Watch dog with alarm output
• –25°C to +85°C operating temp.
Applications
• Rotary application up to 16 bit/
360° absolute position
• Rotary application up to 11 bit user
defined code patterns
• Cost effective solution for direct
integration into OEM systems




Agilent

AEAS-7000 Datasheet Preview

AEAS-7000 Datasheet

Plug and Play Ultra-Precision Absolute Encoder 16-bit Gray Code

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Signal-Channels A1-A11
The photocurrent of the photo
diodes is fed into a trans-
impedance amplifier. The
analog output of the amplifier
has a voltage swing of (dark/
light) about 1.3 V. Every
output is transformed by
precision comparators into
digital signals (D1-D11). The
threshold is at VDD/2
(=Analog-reference),regulated
www.DataSheet4Ub.ycotmhe monitor channel.
Monitor Channel with LED Control at
Pins LEDR and LERR
The analog output signal of the
monitor channel is regulated
by the LED current. An
internal bipolar transistor sets
this level to VDD/2 (control
voltage at pin LEDR). Thus
the signal swing of each output
is symmetrical to VDD/2
(=Analog-reference)
The error bit at pin LERR is
triggered if the Ve of the
internal bipolar transistor is
larger than VDD/2.
Signals Channels A0, A09 with Signal
Conditioning and Self Calibration
These two channels give out a
sine and cosine wave which
are 90 deg phase shifted.
These signals have amplitudes
which are almost constant due
to the LED current monitoring.
Due to amplifier mismatch the
signals do have gain and offset
errors. These errors are
eliminated by an adaptive
signal conditioning circuitry.
The conditioning values are
on-chip preprogrammed by
factory. The analog output
signals of A0 and A09 are
supplied as true-differential
voltage with a peak to peak
value of 2.0 V at the pins
A09P, A09N, A0P, A0N.
Interpolator for Channels A0,A09
The interpolator generates the
digital signals D0,D09 and D-1
to D-4. The interpolated
signals D-1 to D-4 extend the
12 bit Gray code of the signals
D11….D0 to form a 16 bit Gray
code.
D0 and D09 are digitized from
A0 and A09. The channels A0-
A11 and A09 have very high
dynamic bandwidth, which
allows a real time monotone 12
bit Gray code at 12000 RPM.
The interpolated 16 bit Gray
code can be used up to 1000
RPM only. At more than 1000
RPM, only the 12 bit Gray code
from the MSB side can be
used.
LSB Gray Code Correction (Pin KORR)
This function block
synchronizes the switching
points for the 11 bit gray code
of the digital signals D1 to D11
with D0 and D09 (digitized
signal of A0 and A09).
This Gray code correction only
works for the 12 bit MSB(4096
steps per revolution).
It does not work for the 4
excess interpolated bits of the
16 bit Gray code.
When some special applications
require code patterns other
than Gray code, the Gray code
correction can be disabled by
putting pin KORR = 0. When
that happens just the 11 data
bits (D1…D11) will be sent 1:1
to the DOUT serial output.
Gray code correction can be
switched on or off by putting
the pin KORR =1 (on) or =0
(off).
MSBINV and DOUT Pins
The serial interface consists of
a shift register. The most
significant bit, MSB (D11) will
always be sent first to DOUT.
The MSB can be inverted
(change code direction) by
using pin MSBINV.
DIN and NSL Pins
The Serial input DIN allows
the configuration as ring
register for multiple
transmissions or for cascading
2 or more encoders. DIN is
the input of the shift register
that shifts the data to DOUT.
The NSL pin controls the shift
register, to switch it between
load (1) or shift (0) mode.
Under load mode, DOUT will
give the logic of the MSB, i.e.,
D11.
Under shift mode (0), coupled
with the SCL, the register will
be clocked, and gives out the
serial word output bit by bit.
As the clock frequency can be
up to 16 MHz, the
transmission of the full 16 bit
word can be done within 1µs.
Valid data of DOUT should be
read when the SCL clock is
low. Please refer to timing
diagram (Figure 2).
2


Part Number AEAS-7000
Description Plug and Play Ultra-Precision Absolute Encoder 16-bit Gray Code
Maker Agilent
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